(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简

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(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简
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(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简
(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简

(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简
(m n)!/(m n-2)!-n!/(n-2)!=62 (m n)(m n-1)-n(n-1)=62 (m n)^2-m-n-n^2 n=62 m^2 2mn n^2-m-n-n^2 n=62 m^2